Design And Implement Of Signaling System 7 In Integrated Multiplex Equipment

Signaling System 7 (SS7) is mainly used for carrying network signaling between each nodes, is mutual-route signaling network. Because it has many advantages of great signaling volume, low error-code rate, high transmission efficiency and best compatibility and so on, it is widely used for many network communication services so as telephone network, ISDN, mobile communication, intelligent networks.Based on these excellences, user bring out network supporting Signaling System 7, achieving integrated multiplex equipment connecting PSTN and so on.In this article, through analysing actuality of Signaling System 7 research and development trend, according to architecture and characteristics of SS7 and user's requirements, point out SS7 implement plan in integrated multiplex equipment. In system design process, according to the direction of software engineering theory, we experience project establishment, requirement analysis, system design, programming and testing and examination phases and so on, and bring output in each phase to input in next phase. After realizing correlated background and original intent, first, we analyse user's special requirements and special use mode in detail. Based on this point, according to clear requirement and little requirement change, we adopt waterfall model, and complete above 5 phases of software life cycle. Finally, according to characteristics of SS7 layers and modules, adopting function-drived an analysis and design method (structured analyzing and design method), we use from top to down problem analysis method, and decompose integrated multiplex equipment Signaling System 7 system to 4 modules of signaling link, handshake, monitor, calling processing. Every module has single function, and is independent relatively, and is convenient for programming implement and maintenance. We completed the design and implement of SS7 system, achieved design effect, and got good evaluation from user.Implement SS7 gateway function in integrated multiplex equipment, we use integrated multiplex equipments to connect with civil telecommunication network , military mobile trunk communication network which support SS7, can achieve voice, data services intercommunication. At the same time, when two integrated multiplex equipments are connected in civil telecommunication network or military mobile trunk communication network, can achieve voice and data intercommunication through dialing voice setting voice special line and data special line mode. SS7 interface board of the integrated multiplex equipment, achieves signaling data link function by hardware. About signaling link function and telephone user part (TUP), adopts software implement. For the third level signaling network of SS7, only achieves message distinguishing and distributing function. Because integrated multiplex equipment is only adopted as SS7 connection device of network margin, so, we don't achieve message route function.